ANSWER

Faraday’s law of electromagnetic induction states that the
magnitude of the induced emf ε is equal to the time rate of magnetic flux
through the circuit. Let ∆Ф is the change in the magnetic flux during time
interval ∆t, then the mathematical form of the law is

Now let the coil consists of N turns and carrying a current
I. The emf ε in the coil will be given by

Since the current flows in all the turns of the coil,
therefore, the flux linkages due to N turns of the coil is proportional to the
current I in the coil.

Therefore,

This proves the statement.

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